Search SEDIS
| Data sets | Publications | Expeditions | Thesaurus |
Martinsburg Formation  | |
|---|---|
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Paleozoic | |
| ...Ordovician | |
| ....Martinsburg Formation | |
| RT | Virginia |
| Pennsylvania | |
| Maryland | |
| West Virginia | |
| New Jersey | |
| SN | Middle and Upper Ordovician. In Pennsylvania, comprises (ascending) Cocalio Shale, unnamed and undifferentiated dark shales, Jonestown Beds (new), and Fairview Shochary Sandstones. Maryland, New Jersey, SE Pennsylvania, Tennessee, W Virginia, and West Vir |